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Summary of Significant Accounting Policies (Details 6) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Other Assets, Net      
Debt issue costs $ 53 $ 47  
Fair value of derivative instruments 20 20  
Intangible assets 498 311  
Other 59 58  
Other assets, gross 630 436  
Accumulated amortization (84) (54)  
Total Other Assets, Net 546 382  
Debt issuance costs capitalized during the period 18 7  
Write off of debt issuance cost 11    
Amortization expense related to other assets (including finite-lived intangible assets) 44 22 19
Amortization expense for finite-lived intangible assets $ 36 $ 14 $ 14